exam Maths Puzzle Numerical Ability

X^2 + Y^2=16

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exam Other Question

A hose can fill a swimming pool in 6 hours. Another hose needs 3 more hours to fill the pool than the two hoses combined. How long would it take the second hose to fill the pool? THE GRAPHS OF f(x)=x3 AND g(x)=ax3. WHAT CAN YOU CONCLUDE ABOUT THE VALUE OF a?